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Crossref's sustainability model includes an annual membership fee, a per-record registration fee, and additional service fees, while all the metadata remains open without restriction. Crossref provides the technical and business infrastructure to provide for this infrastructure using digital object identifiers (DOIs).
The site hosts public metadata releases from Crossref which contain over 120+ million metadata records for scholarly work, each with a DOI.This was done so to allow the community to work with the entire database programmatically instead of using their API.
In June 2024 a paper got wider audience when a team of researchers found fabricated metadata entered into the Crossref database, which is also sourced by Openalex. Metadata in the reported examples does not contain the real citations any more, but made up citations. [12] [13]
A DOI is a type of Handle System handle, which takes the form of a character string divided into two parts, a prefix and a suffix, separated by a slash.. prefix/suffix. The prefix identifies the registrant of the identifier and the suffix is chosen by the registrant and identifies the specific object associated with that DOI.
The CrossRef metadata includes the correct license for each article: it should be straightforward to tell whether the article is free to read simply looking at this piece of information. Once you comply with these guidelines, the bot should mark your DOIs as free to read in Wikipedia, with a green lock:
The term cross-reference (abbreviation: xref) can refer to either: . An instance within a document which refers to related information elsewhere in the same document. In both printed and online dictionaries cross-references are important because they form a network structure of relations existing between different parts of data, dictionary-internal as well as dictionary external.
A conference, given by Dario Taraborelli, head of research at the Wikimedia Foundation showed that only 1% of papers in Crossref had citations metadata that were freely available and references stored on Wikidata were unable to include the very large segment of non-free data. This coverage expanded to more than half of the recorded papers, when ...
The OpenCitations Indexes are collections of citations, which treat citations as first-class data objects that include citation metadata, as well as identifiers to the citing and cited works. [ 6 ] For example, COCI is the OpenCitations Index of Crossref open DOI-to-DOI citations.